Documentation Revamp

Co-authored-by: jbdoumenjou <jb.doumenjou@gmail.com>

docs/content/operations/dashboard.md

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+# The Dashboard
+
+See What's Going On
+{: .subtitle }
+
+The dashboard is the central place that shows you the current active routes handled by Traefik. 
+
+<figure>
+   <img src="../../assets/img/dashboard-main.png" alt="Dashboard - Providers" />
+   <figcaption>The dashboard in action with Traefik listening to 3 different providers</figcaption>
+</figure>
+
+<figure>
+   <img src="../../assets/img/dashboard-health.png" alt="Dashboard - Health" />
+   <figcaption>The dashboard shows the health of the system.</figcaption>
+</figure>
+
+By default, the dashboard is available on `/` on port `:8080`.
+
+!!! tip "Did You Know?"
+    It is possible to customize the dashboard endpoint. 
+    To learn how, refer to the `Traefik's API documentation`(TODO: add doc and link).
+    
+## Enabling the Dashboard
+
+To enable the dashboard, you need to enable Traefik's API.
+
+??? example "Using the Command Line"
+
+    Option | Values | Default Value 
+    -- | -- | --:
+    --api | \[true\|false\] | false
+    --api.dashboard | \[true\|false\] | true when api is true 
+    
+    {!more-on-command-line.md!}
+
+??? example "Using the Configuration File"
+
+    ```toml
+    [api] 
+      # Dashboard
+      #
+      # Optional
+      # Default: true
+      #
+      dashboard = true
+    ```
+    
+    {!more-on-configuration-file.md!}
+
+??? example "Using a Key/Value Store"
+
+    Key | Values | Default Value
+    -- | -- | --:
+    api | \[true\|false\] | false
+    api.dashboard | \[true\|false\] | true when api is true 
+    
+    {!more-on-key-value-store.md!}
+    
+!!! tip "Did You Know?"
+    The API provides more features than the Dashboard. 
+    To learn more about it, refer to the `Traefik's API documentation`(TODO: add doc and link).